MAX14544 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 28V-Capable, ILIM VBUS Accessory Switch

19-5037; Rev 0; 1/10
28V-Capable, I_LIM V_BUS Accessory Switch
General Description
The MAX14544/MAX14545 are overcurrent detection
switches that can provide power to external accesso-
ries while preventing the host device from damage due
to faulty overload conditions. These analog switches
feature a 270mω (typ) on-resistance and operate from
a +2.3V to +5.5V input voltage range. The selectable
current limit of 200mA or 400mA makes them ideal for
load-switching applications.
The MAX14544 has an autoretry feature, whereas the
MAX14545 has a latchoff feature. When the switch is off,
OUT can withstand 28V maximum. When the switch is on
and a load is connected to the port, a blanking time of
10.5ms ensures that the transient voltage settles down.
After this blanking time, if the voltage across the switch is
greater than the FLAG assertion voltage, the switch turns
off and then a FLAG is issued to the microprocessor.
After the retry time, the device recloses for the duration
of the blanking time to check if the load current is lower
than the limit. The MAX14544 repeats this cycle if the
overload condition is present. During the cycle, FLAG
remains asserted. The MAX14544 remains on after the
overload condition is removed and FLAG deasserts. For
the MAX14545, after the blanking time, the switch turns
off and then a FLAG is issued to the microprocessor. The
switch can be turned on again by cycling the power or
the EN input.
The MAX14544/MAX14545 have additional safety fea-
tures that include thermal shutdown protection, reverse-
current blocking, and overvoltage protection.
The MAX14544/MAX14545 are offered in a space-sav-
ing, 8-pin, 2mm x 2mm TDFN package, and operate over
the -40NC to +85NC extended temperature range.
Cell Phones
MP3 Players
PDAs
Digital Cameras
eBook
MID
Applications
Typical Operating Circuit appears at end of data sheet.
Features
S 200mA or 400mA Selectable Current Limit
S Output Capable of Withstanding +28V
S Reverse-Current Shutdown Protection
S +2.3V to +5.5V Input Operation Range
S Undervoltage Lockout
S Autoretry or Latchoff Option
S Thermal Shutdown Protection
S 0.1µA (typ) Shutdown Current
S 5µs Fast Current-Limit Detect
S 8-Pin TDFN (2mm x 2mm) Package
S -40NC to +85NC Operating Temperature Range
Ordering Information/
Selector Guide
PART
PIN-
PACKAGE
TOP
RETRY/
MARK LATCHOFF
MAX14544ETA+T
MAX14545ETA+T
8 TDFN-EP*
8 TDFN-EP*
ACY
ACZ
Autoretry
Latchoff
Note: All devices are specified over the -40°C to +85°C tem-
perature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
+
IN 1
IN 2
ISET 3
GND 4
MAX14544
MAX14545
*EP
8 _OUT
7 OUT
6 EN
5 FLAG
TDFN
*CONNECT EXPOSED PAD TO GND.
________________________________________________________________ Maxim Integrated Products   1
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